Hello, Kia! Great attempt with your questions, but I have made some edits. Please keep in mind that I am from the United States and am offering suggestions from an American English perspective. Let me know if you have any other questions!
1. I'm calling you to inform you about the quote for our product. Do you have 10 minutes to speak with me?
2. Do you have a few minutes to discuss the estimate (for our product)?
3. If you have a moment, I would like to inform you about our estimate (for the product).
4. Do you have a minute to discuss the quote (for our product)?
Please keep in mind that 'estimate' is used to describe an approximate number for the value, cost or worth of an item or a service. The final cost might be higher or lower.
A 'quoted' price is different. It is a verbal or written agreement to sell a product at the stated amount. If you quote the price of something to be $100, that is what your customer or client will expect to pay. If you later sell something for higher than the originally quoted price, you will have to explain why you have changed the original quoted price, and the customer not be happy to hear there was a change in price (quoted price = exact amount charged).
I hope this answer helps. If you are interested in taking English lessons, I am a professional English teacher on Italki. I am currently accepting new students and would be happy to work with you.